Abstract
Femtosecond and picosecond time resolved spectroscopy was applied to didecyl-sexithiophene (2D6T) in solution using one and two photon excitation. Transient absorption bands form immediately after excitation and remain nearly stable between 0.4 and 10 ps. Induced fluorescence arises about 400 fs after excitation and increases further up to 10 ps. The results were explained by a storage level (2Ag) above the 1Bu-state. The decay of excited state absorptions and the formation of the triplet absorption in 2D6T were observed.
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